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Mon, 13 Feb 2023 16:31:43 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1676305905; bh=zXPbJqCldaAU06/Pl15/EuPbGqrq9pdX/EO4Oo9v1hc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GYFOIYPmxJOzBKz1ZV9fqB+BQADrG3NwplIW6YVJvdlwMcF900XODPcitVTeMK+xu WyzYsudjY2R0JcqaW0yu+kJjo4I2Y2Ktr4vOe8ItJX8fERsZLx/mlS3FcyoUROreqD 04wSEDRf2I1KSq3MSFXmP+Org06bmw3vWmE5n2DN+gDw2DqPPGQqO4u2fuJeq/3Q1k O2JW0/FF5FGvPOdeNKqofOVsixD9WHdLZVNG1p3O0cBuR3bxaaObpw9J6V+hqzZJ5j 34sbj4V4u2gcbXyYW9zdXNQww0NppB1iq++eIsgoAULWBJLUftJYUY/XduedhHk0Na bRDn8Iu/ee5ow== From: Muhammad Usama Anjum To: peterx@redhat.com, david@redhat.com, Andrew Morton Cc: Muhammad Usama Anjum , kernel@collabora.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] mm/userfaultfd: add VM_WARN_ONCE() Date: Mon, 13 Feb 2023 21:31:24 +0500 Message-Id: <20230213163124.2850816-2-usama.anjum@collabora.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230213163124.2850816-1-usama.anjum@collabora.com> References: <20230213163124.2850816-1-usama.anjum@collabora.com> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 7E78AC002C X-Stat-Signature: 3s49f6r4whwkdcsatoiei3j5cdhcwq5c X-Rspam-User: X-HE-Tag: 1676305906-340013 X-HE-Meta: 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 E7rT/Z4X idtZBsHgKDNa9sp+ytqUAr6NdeSaIx0zQ5k9GMRvwUHaBQRG1ARmAY1RD9oDFyYFv4Qi+z3gaFoyX3fKUPeycKvAnOrYNOlBbe0+08DK5bIrblwePhFF7vcYHgDH6koODy2bLJlkaxEk9ReZdaxn+cxwIesVLjSnZF0MLS6fVEho4ub4B1uvW/Cq4FUMB3JMouOfVNuhO1yT1rtCCEPn8oKbBGQhZPhaWnCQ+wKhmWiYxebfKy4XJqMcn4MGdYZqki3VVQau7/8X2zg8VNJrAqFPgjg3kQUDV840hZKH4V6+m4Lyh6XStt9TuIw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add VM_WARN_ONCE() to uffd_wp_range() to detect range (start, len) abuse. Signed-off-by: Muhammad Usama Anjum --- mm/userfaultfd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index bccea08005a8..14ec88301511 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -716,6 +716,8 @@ void uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma, unsigned int mm_cp_flags; struct mmu_gather tlb; + VM_WARN_ONCE(start < dst_vma->vm_start || start + len > dst_vma->vm_end, + "The address range exceeds VMA boundary.\n"); if (enable_wp) mm_cp_flags = MM_CP_UFFD_WP; else